Malicious PDF — malware analysis report

Static analysis result for SHA-256 009df87fbf13ff3a…

MALICIOUS

PDF

86.0 KB Created: 2021-03-31 04:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ffd0bf01a56bfba0231939b15e39119 SHA-1: 72639438c6d9b1f0cc682257599de24b2ee3ee04 SHA-256: 009df87fbf13ff3a4a619ce36593944a0b49a183a01e807e6e704d0214c796b2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=baldur%2527s+gate+2+romance+neera PDF link annotation
    • http://eeuuurrrrr.space/lemenidz062.pdfIn PDF document text
    • http://zavolofa.mygamesonline.org/folic_acid_and_neural_tube_defects.pdfIn PDF document text
    • http://itslm.fun/nozadixovukebis5prej.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/surekosekowifutusabod.pdfIn PDF document text
    • http://trysalon.xyz/vuxudomarumir10b14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b65eb1af-7bb2-4440-96bf-fd84cad057dc/dazafupoferupakizidurudi.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_6fbfccaeb7f345549727772e6118424c.pdf?index=trueIn PDF document text
    • http://kubowulurarekij.myartsonline.com/algorithms_and_data_structures_in_python.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_26058ca933254f388e2e21519c9099e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f95950-c0fe-4cc6-9866-5148eae22e40/zitovup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2a616c-b766-49ec-b241-851bf1f6db2a/symbols_for_abigail_in_the_crucible.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_041de1f6fbe5435d824e76031aae7402.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_1fe83a0175d3492193a2b7b24f9d0dd2.pdf?index=trueIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_fd463d66fd1841aeba4e6eb075da961b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bac714-456a-43b8-aeae-0560b4dc5254/from_flat_to_all_that_week_9_and_10.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_30293d720b69412eab2eb92cb891e3ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a4068a-78d7-4778-8a0b-0bb8cc2dc673/medezos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 5308 bytes
SHA-256: f5b151a794d189b5171c3c4d989f8f8ca4ddd37d06b8384f49373b432dd6dce1
font_01_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 11000 bytes
SHA-256: 5a4bfe6ee374cf14dc7bf481eaa48bff23e2a428e7790c98f46630b44ae336c8
font_02_sfnt_off00013ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CED 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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